FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

10 August 2007 AGE-NC Project No.06-1481 Page 2 of 5 • A 1,000-gallon UST was removed from the southeast corner of the western building on Parcel 03 in 1986. Soil contamination was found immediately below the tank;subsequently, the tank area was over-excavated. Confirmation sampling noted non-detect for all analytes, and the site was closed by EHD in 1996. • Historical research of the property identified potential former above ground and underground storage tank areas and former in-ground separators. SOIL PROBE BORING ADVANCEMENT On 24 July and 25 July 2007,AGE advanced six soil boring(B-2 through B-7)in the identified areas of concern(Figure 2)to assess for contaminant-impacted soil and ground water beneath the site.Soil borings were advanced utilizing a van-mounted Geoprobe 5400 direct-push probing unit equipped with 1.25-inch probing rods; the Geoprobe advances soil probe borings using a hydraulic hammer to drive soil sampling tools to specified depths.Two borings(B-5 and B-7)were advanced to a depth of 10 feet below surface grade(bsg),and two borings(B-3 and B-4)were advanced to a depth of 20 feet bsg; only soil samples were collected from these borings. Soil borings B-2 and B-6 were advanced to total depths of 47 feet and 45 feet bsg,respectively;both soil and ground water samples were collected from these borings. The location of soil borings are illustrated on Figure 2. SOIL AND GROUND WATER SAMPLE COLLECTION Soil samples were collected at 5-foot intervals beginning at 5 feet bsg to the total depth of each boring.Each sample was collected utilizing a Geoprobe soil sampling assembly loaded with four six- inch stainless steel sleeves.After collection,the ends of the second stainless sleeve was covered with Teflon sheets,capped and sealed with tape.The sleeve was labeled with soil boring location,depth, time,date and sampler's initials and then placed in a chilled container. Soil sample duplicates were extruded into plastic bags and field-screened for the presence of organic vapors using an organic vapor meter(OVM), equipped with a photo-ionization detector(PID). Grab ground water samples were collected from soil borings B-2 and B-6 using a temporary PVC screen.A Geoprobe push-driven water sampling device was advanced two to three feet into the water bearing zone. Samples were collected using a Geoprobe water sampling assembly fitted with a new one-half inch 0.010-inch slotted temporary well screen. Each ground water sample was extracted using inertial action by lowering Teflon tubing through the hollow center of the push rods into the screen section. Sufficient sample was collected to fill four 40-m1 EPA-approved volatile organic analysis (VOA) vials and one 1-liter amber glass container. The ground water sample containers were labeled with soil boring designation, date, time, and samplers initials and then placed in a Advanced GeoEnvironmental,Inc.